Harrow-jack.



No. 696,697. Patented Apr." I, I902. N. W. THOMPSON.

HARROW JA'bK.

(Annlication medAu 31, 1901.

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(No Model.)

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'No. 696,697. Pa tented Apr. I902.

N. w. THOMPSON.

HABROW JACK.

(Application filer! Aug. 31, 1901.) (No ModeL, Y 2 Sheets-Sheet 2.

antenna! PATENT trio NELSEN IV. THOMPSON OF BIGLOIV, OREGON.

MARROW-JACK.

SPEGIFICATION forming part of Letters Patent No. 696,697, dated April 1,1902. Application filed August 31, 1901. $erial1l'o. 73,996. (No model.)

To (ZZZ whom it may concern.-

Be it known that I, NELsEN W. THOMPSON, a citizen of the United States,residing at Biglow, in the county of Sherman and State of Oregon, haveinvented new and useful Improvements in Harrow-Jacks, of which thefollowing is a specification.

This invention relates to barrow-jacks; and the object in View is toprovide in connection with a single or multiple harrow means whereby thebarrow-frame or the sections thereof may be lifted or tilted for thepurpose of clearing from the teeth trash or other matter adheringthereto, so as to keep the harrow-teeth in good operative condition.

It is also an object of this invention to provide in connection with amultiple harrow or a barrow comprising a series of harrow-sections meanswhereby any one of the harrowsections may be tilted or liftedindependently of the other sections.

The tilting device or jack is so constructed and arranged with respectto the frame of the barrow-section that when released by means of asuitable tripping device it will thereafter act automatically to elevateand lower the harrow-section with which it is associated. The jack maybe thrown into operation at any desired moment by means of a trip underthe control of the operator.

WVith the above and other objects in View the invention consists in thenovel construction, combination, andarrangement of parts hereinafterfully described, illustrated, and claimed. 1 In the accompanyingdrawings, Figure 1 is a plan view of a harrowcomprising a number ofsections, each of which is equipped with an independently-operable jack.Fig. 2 is an enlarged plan View of a single harrowsection, showing thejack and tripping device. Fig. 3 is a central longitudinal sectionthrough the same, showing the jack in operation. Fig. 4 is a detailperspective View of the jack.

Like numerals of reference denotelike parts in all the figures of thedrawings.

The operating-jack contemplated in this invention is equally applicableto a single harrow or to a harrow comprising a plurality of sections. InFig. 1 I have illustrated a harrow comprising a series of sections 1, 2,

l and 3, all of the sections being coupled to a common drag'bar 4, towhich is applied a draft attachment 5. In said figure it will be seenthat an independent operating cord or connection is used for the jack ofeach harrow-section, thus enabling any one or more of the sections to beraised or tilted for clearing the trash and other matter therefromwithout interfering with the other sections.

In describing the details of construction reference will be madeespecially to Figs. 2 and 8, in which it will be seen that theharrow-section 1 is provided with a pair of rearwardly converging bars 6and 7, the same being bolted, riveted, or otherwise secured at S to theframe of the harrow, said bars extending in rear of the frame of theharrow and forming practically a rigid projecting bracket. One of thebars, as 6, is shorter than the other bar, and a pivot-bolt or shortaxle 9 is passed through the projecting ends of the bars 6 and 7 to forma fulcrum for the jack 10. This jack is in the form of a straight barhaving the opposite ends thereofpointed, as at 11, and providedcentrally with a 1ongitudinal slot 12, through which the bolt or axle 9passes. The jack normally occupies a substantially horizontal position,as shown in Figs. 1 and 2,with the bolt9 resting in the rear end of theslot 12. Therefore the forward portion of the bar is the longer,and.consequently the heavier, so that when said bar or jack is released, theforward end falls to the ground, causing the pointed extremity thereofto engage the soil, whereupon in the further forward movement of theharrow the jackis brought to a vertical position, as shown in Fig. 3.This elevates the rear end of the harrow and causes the trash and othermatter adhering to the harrow-teeth to be dragged therefrom by thestubble. In the further forward movement of the barrow the jack falls toits normal horizontal position and is then slid forward to be inreadiness for a second operation. In order to provide means forreleasing or tripping the jack, one of the bars, as 7, is made longerthan the bar 6, and a bell-crank trip-lever 13 is fulcrumed thereon, asshown at 14. The shorter arm of said trip-lever normally projects acrossthe path of the jack, as clearly shown in the plan views, while thelonger arm of thetrip-lever is held in proper position by means of aretracting-spring 15. Connected with the outer extremity of thetrip-lever is a trip-cord 16, which the operator grasps in order to rockthe trip-lever out of engagement with thejack.

From the foregoing description it will be seen that all the operator hasto do is to pull upon the proper trip-cord 16, whereupon the jack ofthat harrow-secti-on will be released and will automatically operate toraise and lower the rearend of the barrow-section with the resultstated. After the jack returns to its horizontal position it is slidforward and is then held in a horizontal position by means of thetrip-lever 13. y The operator may thus throw one or more of the jacksinto operation,each jack operating independently of the others. j

It will of course be understood that the jack: or lifter-bar may be madeof a length suitable to give the desired tilt or elevation to thebarrow-section and that the slot 12 may be made longer or shorter, asmay be deemed expedient. These and other changes in the form,proportion, and the minor details of construction may be resorted towithout departing from the principle or sacrificing any of theadvantages of this invention.

Having thus described the invention, what is claimed, and desired to besecured by Letters Patent, isc 1. The combination with a harrow, ofajack having a central longitudinal slot wherein it is loosely connectedtherewith.

2. The combination with a barrow; of a reversible jack pivotally mountedin the rear of the barrow and connected with the frame thereof.

3. The combination with a harrow having rearwardly-projecting bars; of ajack pivotally mounted between said bars, and means for holding andreleasing the jack.

4. The combination with a harrow of a jack pivotally mounted in rear ofthe harrow and connected therewith, and a trip-lever arranged to have aportion thereof moved into and out of the path of the jack.

5. The combination with aharrow of rearwardly-converging bars projectingtherefrom, a centrally-slotted jack pivotally mounted between said bars,a trip-lever for holding and releasing said jack, a spring forretracting said trip-lever, and means for operating the trip-lever.

6. The combination withaharrow; of rear- Wardly-converging barsextending backward therefrom, a bolt or axle connecting the rear ends ofsaid bars, a jack having a centrallyarranged longitudinal slot whichreceives said bolt or axle and adapts the jack to be slidlongitudinally, and a tripping device for holding and releasing thejack.

In testimony whereof I aflix my signature in presence of two witnesses.

NELSEN \V. THOMPSON.

Witnesses:

R. J. GINN, R. E. HosKINsoN.

